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    SubjectRe: [PATCH v4] sched: automated per session task groups
    On Sat, Dec 4, 2010 at 3:55 PM, James Courtier-Dutton
    <james.dutton@gmail.com> wrote:
    > On 3 December 2010 05:11, Paul Turner <pjt@google.com> wrote:
    >>
    >> I actually don't have a desktop setup handy to test "interactivity" (sad but
    >> true -- working on grabbing one).  But it looks better on under synthetic
    >> load.
    >>
    >
    > What tools are actually used to test "interactivity" ?
    > I posted a tool to the list some time ago, but I don't think anyone noticed.
    > My tool is very simple.
    > When you hold a key down, it should repeat. It should repeat at a
    > constant predictable interval.
    > So, my tool just waits for key presses and times when each one occurred.
    > The tester simply presses a key and holds it down.
    > If the time between each key press is constant, it indicates good
    > "interactivity". If the time between each key press varies a lot, it
    > indicates bad "interactivity".
    > You can reliably test if one kernel is better than the next using
    > actual measurable figures.
    >
    > Kind Regards
    >
    > James
    >

    Could you drop me a pointer? I can certainly give it a try. It would
    be extra useful if it included any histogram functionality.

    I've been using a combination of various synthetic wakeup and load
    scripts and measuring the received bandwidth / wakeup latency.

    They have not succeeded in reproducing the starvation or poor latency
    observed by Mike above however. (Although I've pulled a box to try
    reproducing his exact conditions [ e.g. user environment ] on Monday).
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